Run script on login and/or wake

I'm looking for a way to know when a user is available -- similar to how a
chat application might know if a user is available by keyboard or mouse
activity.

That is, I'd like to run a script when a user first logs in (which might be
automatic login as, for example, Ubuntu allows), and when the computer wakes
from sleep or "unlocked".
Not sure if this is a Gnome issue or maybe lower level -- like via dpms.

Any easy hooks for doing something like this?

--
Bill Moseley
moseley@xxxxxxxx
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